**Intersections** can be regulated by **circular traffic lights for vehicles**. These traffic lights control the flow of traffic at intersections, indicating to drivers when they must stop or proceed.

- **Circular traffic lights** have lights of different colors that indicate specific actions:
- **Solid red light**: Prohibits vehicles from passing.
- **Solid yellow light**: Also prohibits passing, but allows vehicles that cannot stop safely to continue.
- **Solid green light**: Allows passage and gives priority to vehicles in the crossing.


- Additionally, they may have **arrows** indicating specific directions in which vehicles can proceed, always respecting the color of the light.

On the other hand, **square or lane traffic lights** do not regulate entire intersections but apply only to vehicles in the specific lane where they are located. Therefore, they are not suitable for controlling traffic at an intersection.

In summary, **circular traffic lights for vehicles** are used to regulate traffic at intersections, ensuring an orderly and safe flow.